Describes the procedure by which a seaport receives cargo for distribution. Shows conveyor systems, pumps, and electromagnets used in handling goods; and explains the work of seamen, longshoremen, and customs officers. Shows the port of San Francisco and the SS President Cleveland. Shows old SF Muni streetcars stacked and ready for scrap, four longshoreman standing around doing nothing while another unloads bananas. Discusses roles of personnel on ships, loading and unloading. Ship passes under Golden Gate Bridge.